Vehicle turned up to provide weapons and support for a ship (7)
I believe the answer is:
yardarm
'weapons and support for a ship' is the definition.
I can't judge whether this defines the answer.
'vehicle turned up to provide' is the wordplay.
'vehicle' becomes 'dray' (type of cart).
'turned up' is a reversal indicator.
'to' means one lot of letters go next to another.
'provide' becomes 'arm' (arming is a kind of providing).
'dray' back-to-front is 'yard'.
'yard'+'arm'='YARDARM'
Can you help me to learn more?
(Other definitions for yardarm that I've seen before include "First drink, when sun over it" , "part of ship" , "Hanging place on board old ships" , "Either end of a sail beam" , "Ship's beam" .)